6.At first, people raised dogs to help them hunt and to warn them when danger ______ . Today, cats and dogs are kept largely as pets.

A.reproached B. approached C.appreciated D. apprehended

Best Answer:B

详解：应选B项。approach意思是“接近，靠近”;reproach意为“责备”;appreciate意为“欣赏”;apprehend意为“理解，忧虑”。

7.For a child to give up his less mature idea for a more mature one, it requires that the child ______ psychologically really for the new idea.

A.would be B. were C.be D. is

Best Answer:c

详解：应选C项。require要求从句的谓语省略should +动词原形。

8.They do not have to pay for expensive seats at the theater, the cinema or the opera, ______ , perhaps, that show is disappointing.

A.only to discover B. only discovering C.only so as to discover D. only for discovering

Best Answer:A

详解：应选A项。only to do sth意为“结果只是…”，其逻辑主语是they。

9.I ______ admit the truth or your remarks, although they go against my interests.

A. can but B. may not to C.can't but D. need but

Best Answer:C

详解：应选C项。can't but的意思是“不能不”。